[24.06] Simultaneous RXTE/OSSE Measurements of the Diffuse X-ray/\gamma-ray Radiation from the Galactic Plane

A. Valinia (NASA/GSFC), R.L. Kinzer (NRL), F.E. Marshall (NASA/GSFC)

We present the first simultaneous RXTE/OSSE measurements of
the diffuse X-ray/\gamma-ray radiation from the Galactic
plane near the Scutum arm region. The contribution of
discrete hard X-ray sources detected by RXTE has been
determined and subtracted from the hard X-ray/soft
\gamma-ray spectrum obtained by OSSE. As a result the
least contaminated spectrum of the diffuse emission has been
obtained. The spectrum in the 3-500~keV enrgy band is best
fitted with a thermal component plus an exponentially cut
off power law model which dominates above 10 keV. We discuss
the origin of the emission in terms of both unresolved
discrete sources and diffuse radiation processes.

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